FACTOID # 106: Americans are 15% more innovative than the Japanese. But in percentage terms, the Japanese grant 3.5 times more patents.
 
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Encyclopedia > Photometry
  • In astronomy, photometry is the measurement of the flux or intensity of an astronomical object's electromagnetic radiation.
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Encyclopedia4U - Photometry - Encyclopedia Article (347 words)
Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.
Historically photometry was done with a photoelectric photometer, an instrument that measured the light intensity of a single object by directing its light on to a photosensitive cell.
Photometry is generally used to generate light curves of objects such as variable stars and supernova where the quantity of interest is the variation of total light energy output over time.
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